# encoding: utf-8
import re
import urlparse

from bs4 import BeautifulSoup


class HtmlParser(object):



    def parse(self,page_url, html_content):
        if page_url is None or html_content is None:
            return

        soup = BeautifulSoup(html_content,'html.parser',from_encoding='utf-8')

        new_urls = self._get_new_urls(page_url, soup)
        new_data = self._get_new_data(page_url, soup)
        
        return new_urls, new_data

    def _get_new_urls(self, page_url, soup):
        new_urls = set()
        # /item/1233
        links = soup.find_all('a',href=re.compile(r"/item/*"))
        for link in links:
            new_url = link['href']
            new_full_url = urlparse.urljoin(page_url, new_url)
            new_urls.add(new_full_url)

        return new_urls

    def _get_new_data(self, page_url, soup):
        res_data = {}

        # url
        res_data['url'] = page_url

        # <dd class="lemmaWgt-lemmaTitle-title"> <h1>Python</h1>
        title_node = soup.find('dd',class_="lemmaWgt-lemmaTitle-title").find("h1")

        res_data['title'] = title_node.get_text()


        # <div class="lemma-summary" label-module="lemmaSummary">

        summary_node = soup.find('div',class_="lemma-summary")

        if summary_node is not None:

            res_data['summary'] = summary_node.get_text()

        return res_data